A schema of a database system is its structure described in a formal language supported by the database management system (DBMS) and refers to the organization of data to create a blueprint of how a database will be constructed (divided into database tables).

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Migrate SQL server data to new schema

I have a database that was originally created by a couple of people for a small business unit (about 8 staff and 10 customers) in MS Access. The original 'developer' was a non-geek who had been sent ...
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26 views

Chemical Availability Database Schema

Looking to create a database to track available inventory by lot number on a database. Raw Materials are received in batches with id #'s in units of pounds and pulled in different amount from those ...
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Oracle schema import is not importing all the tables present in the schema dump file

I have exported an existing oracle schema from another machine and then imported it in my local machine. Import was successful, but some tables which are present in the export dump file are not ...
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140 views

Is my shopping list database schema good enough?

I'm wondering if my schema is correct? It's intended to hold shopping list items for each user, a user belongs to a household. Items will be added to the household. The stocklist will to hold the ...
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4 views

How would I script standing up a MySQL instance with certain specs?

Context: I seem to be unable to find in MySQL Workbench schema creation process where I can adjust server specs like max memory (2 GB); CPU usage, 1x 4 core; 20 GB SSD/Flash storage; OLTP; OS (RHEL ...
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119 views

MySQL Junction Table as Foreign Key?

I have several tables: company, customer, company_has_customer, and transaction. company_has_customer is a many-to-many junction table using the PKs of company and customer as its PK. In almost all ...
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20 views

OLEDB provider for linked server reported change of schema version error

I am trying to run a report but its giving this message: An error has occurred during report processing. (rsProcessingAborted) Query execution failed for dataset 'ParamYear'. ...
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24 views

Good reason to convert LONGTEXT column to smaller width if field is smaller?

We have a database that uses a LONGTEXT type for a column that does not need that much space. The maximum row size currently has about 6500 characters and that's with a few million inserts so it's ...
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1answer
11 views

Joining on a M-N lookup table vs keyword searching a single column

I am in the process of writing an image gallery webapp similar to that of Danbooru, and in the process, decided to take a look at danbooru's database schema for an idea about how things are ...
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19 views

Cassandra filtering multiple items

I am attempting to learn Cassandra by taking my RDBMS database and create a nosql version of it. Forgive any mistakes I am just making a quick example so I can ask my question. Here is my ...
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1answer
30 views

Store the content book in database, so that it would be updated afterwards or store them as document?

I have some books in (urdu) made with Urdu Inpage(tool for making pages in urdu) like this: problem that these document files are difficult to read in php because they gives unread-able characters, ...
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34 views

Permissions on Trigger Problem

I am working with a database in MS-SQL 2008 R2, and I'm running into a problem. The basic setup is this: There are two tables of interest: dbo.Assesments and audit.Assesments. dbo.Assesments is the ...
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28 views

Design db schema in correct way for parent child kind of requirement

I am creating schema of tables. But not able to understand best way to do it. Following are the tables: Car Model - It contains all car models with types. For eg. Mercedes(brand) - GLA ...
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66 views

Difference between a schema and a database in db2

I can not figure out what is the difference between schema and database in db2 I find this SQL so confusing for example : CREATE TABLE schema1.table1 .... .... .... IN database1.tabspace1 Can ...
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33 views

PUBLIC privilege potential security threat - Oracle database

Recently, audit findings at my site found that PUBLIC being by default assigned to all the schemas that are created is a big risk since when a new user is created and even if we were to assign only ...
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1answer
219 views

SET sql_log_bin = 0 in RDS MYSQL 5.6

I have moved into RDS MYSQL 5.6 and now I have a problem. I have 5 read replicas and a/z master. I am trying to alter a table and want to change a column value and also on some tables I want to add a ...
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1answer
25 views

Is it possible to create a multi-layer schema in SQL Server 2008 R2?

For instance so you can specify a department, and then maybe have finer levels of granularity? CREATE SCHEMA hr; CREATE SCHEMA hr.reportl; CREATE SCHEMA hr.report2; The last two statements fail.
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40 views

pg_restore slow after adding a check function

I have a postgres database with 10 schemas, and recently I had to find a way for some tables between schemas to have common records. The way I did this was to remove the foreign key on some tables in ...
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45 views

Relationships mess

Say I have a table ads, and each ad has several medias - held in a medias table. Each media can be one of several types. Types are in a media_types table. So, for example, an ad has two medias: one ...
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273 views

PizzaShop - DB - Normalized Schema

I am trying to make a simple DB in Access for a theoretical pizza shop(the db is for an assignment). What I am trying to do is link one type of pizza to one or more types of toppings. I just wanted a ...
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1answer
52 views

ORA-00942: table or view does not exist- Can it be solved by granting privileges to user?

I am creating a Java application that connects to an Oracle Database. In the application I connect to the DB as User A, which works as intended. I then try to access tables in Schema 1 and Schema ...
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2answers
107 views

How does a users DEFAULT_SCHEMA get set to something other than “dbo”

One of the settings for a SQL Server user is the DEFAULT_SCHEMA. This is frequently dbo but not always. I realize you can change the setting by using this code: ALTER USER [UserName] WITH ...
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34 views

Registration Schema Implementation

I'm building an online app that is going to handle reservations. Individuals making reservations can make one for a single day or multiple days. I have come up with two schema and cannot see much of a ...
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Address database scheme - multiple links

I am currently building a databse scheme for a small company. But at the point doing it I figured out that my attept will be unacceptable due to the ability that one action will affect multiple ...
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4k views

Which datatype to store XML data in: VARCHAR(MAX) or XML

I am defining a schema for a new set of resources using SQL Server 2008... In this case, each record (e.g. row) will need to store XML fragments. From time-to-time; although not frequently; I'll need ...
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34 views

Handling Strong and Weak entity types in a one-to-one relationship

I am modelling a database for a term project and I have come across something I do not have a definite answer to. Diagram I was supplied with the following Entity-Relationship diagram: ...
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468 views

Should we create a schema per “project”?

This is a database where users create a 'project' and work on it. We have a table for project and various other tables that contain different attributes for project (multiple rows for each project ...
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29 views

Array or Object?

I am using MongoDB and designing a database. There is a list of itemCode. It won't change, but some new one will be added at some point. The total number of itemCode will never be over 100. Each ...
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1answer
219 views

Schema design for products with multiple variants/attributes?

I'm using MySQL. The idea is similar to shopify with a different concept, so users are going to add their own products with multiple types of variants and attributes. From all the research I've done ...
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22 views

List Schema Size - PostgreSQL 9.2

I'm trying to get a real schema size... But I'm getting different results using two queries. Can you please help with a real trusted query to get the size of a schema? Schema name: gorfs Query 1: ...
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55 views

Does exist some software for transforming data from one DB schema to another?

I need to transform between two different database schemas the same data. For example i have one table in old schema like this: and i need to transform it to new schema like this: So i have few ...
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49 views

What is the name of the default schema in Oracle?

When you create an object in Oracle, and do not specify a schema (object prefix), is there a name for that default schema? I see in Oracle SQL Developer, that a newly created object shows up in the ...
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46k views

Copy complete structure of a table

Using some methods, when you create a copy of a table you lose indexes, PK, FK, etc. For example in SQL Server I can say: select * into dbo.table2 from dbo.table1; This is just a simple copy of the ...
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21 views

Database schema for timesheet app?

I am very new to database managements as I am enrolled in my first class involving databases at university. For my project, I have to create an app that clocks employees in an out and keeps track of ...
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Category of the same object in SQL and Inheritance.

I am trying to make the relational schema for a shop which sells ice creams and drinks. As the ice creams and drink both fall in the same category of Items, i tried making the items entity but i am ...
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20 views

Table design one or more

I am struggeling with the following issue. I have a table executives and supervisor, quite similar in the structure. Both of the executives can have a Car one or more. Should I make a table ...
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80 views

Best design to reference multiple tables from single column?

Proposed schema First and foremost, here is an example of my proposed schema to reference throughout my post: Clothes ---------- ClothesID (PK) INT NOT NULL Name VARCHAR(50) NOT NULL Color ...
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215 views

Efficient Database schema for multi-lingual content?

Assume I have a table for blog posts, posts, and schema as id author title content and each post can belonged to some categories id name descrtiption So a blog post can belong to multiple ...
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9 views

Database ERD for orders info

I have two tables: 1-orders order_id 2-shipping_and_billing order_id FK address_type(billing and shipping ) city I need to get full info of shipping and billing in single select of ...
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56 views

Database design in MySQL workbench

After doing some change As Mr Vérace told me here in this question, by changing the id names of each table into table_name_id and using the singular notation, I still need your opinion about this ...
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30 views

Manual postgres migration for Django (python) app

I have a Django (python) data model called Message: class Message(models.Model): text = models.CharField(max_length=50) sending_time = models.DateTimeField(auto_now_add=True) I added sender ...
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1answer
87 views

Database design for dentists

I have a homework, where I should create a database for a dental clinic using MySQL Workbench. This database will be used later for a web app for dentists. Here is a picture of the database design: ...
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769 views

Installing OE (Order Entry) schema in Oracle Express

I'd like to know if it's possible to install OE (Order Entry) schema in Oracle Express. If so, how can I do that?
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1answer
161 views

Design for scientific data. Data table with hundreds of columns or data table with a generic value column and hundreds of rows (EAV)?

I am trying to improve the data storage in biomedical science lab where I recently started working. The existing workflow is atrocious, involving many differently formatted Excel sheets that all get ...
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3answers
66 views

Help with database schema design

I'm working on an Android application which utilizes a number of MySQL databases. The design is as such: Users have many recipes. Recipes have many ingredients Recipes have many directions I ...
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11 views

Restrict postgresql roles based on rows in upper level table

We have a postgresql database, and it is expanding to be used by more groups. The data from these groups will all live together in the same tables, but we need to restrict access to the data based on ...
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1answer
23 views

Login Schema Role User Setup

Environment: Windows Server 2012 SQL Server 2014 Standard Public website (Site-A) on Server Private website (Site-B) on Server Windows App running on workstations SQL Server 2014 Standard: 2 ...
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1answer
177 views

ERD for a web development company

I am working on an ERD which represents the relationships between entities in a Web development company behavioral model. There I have entities like: Customer Service ----------- (like: web ...
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1answer
44 views

Explaining the problem with a column of values from a non-mutually exclusive domain

I'm trying to convince the powers-that-be that their current database design is risky and inefficient. I'd like to verify whether my assumptions are correct, and I'd like help in finding technical ...
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603 views

Database design of Room Booking system in a Hotel

Intro and System Description I am currently designing a Database for a Room Booking system in a Hotel. Client fills a Form / Request with following information about Room: amount of people in ...